Arm chair



FIG. 1 is a side elevational view of an arm chair showing my design, the opposite side being a mirror image thereof;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for the arm chair, as shown and described. 